Rack Mount V-twin problem

Triaxis, Quad Preamp, Stereo Power series, Recto Preamp

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Subhumantd
Bottle Rocket
Posts: 2
Joined: Thu Feb 01, 2018 3:42 pm

Rack Mount V-twin problem

Post by Subhumantd » Thu Feb 01, 2018 3:57 pm

I'm having an issue with my V-twin Preamp. It works fine for a while, say an hour or less, then all the output fades out. The power stays on, it just doesn't put out any sound. If I let it sit powered off for a while, it might come back, but sometimes doesn't for quite a while(the next practice, days later). I let an electrical engineer friend look at it, and he said the resistors on the right side of the board(from the front) were getting very hot, in the upper 200 degree range, but he hadn't found anything yet that he thought would cause the problem.

I was wondering if anybody had heard of anything like this, or knew what might cause it to happen?

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a2dconverter
Mark II
Posts: 89
Joined: Thu Mar 26, 2009 9:01 pm
Location: Canada

Re: Rack Mount V-twin problem

Post by a2dconverter » Thu Feb 01, 2018 7:08 pm

Here's what worked for me...

I recommend changing those resistors to 5 Watt and adding a fan and side vents...

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More info here...

http://www.stagecue.com/vtwin.html

I hope this helps

Seeya

Joe
Last edited by a2dconverter on Fri Feb 09, 2018 3:11 pm, edited 4 times in total.

Subhumantd
Bottle Rocket
Posts: 2
Joined: Thu Feb 01, 2018 3:42 pm

Re: Rack Mount V-twin problem

Post by Subhumantd » Fri Feb 02, 2018 4:47 pm

I definitely don't like how hot those resistors get, so this might be something to try.

I talked to a mesa tech near me, and he said there were any number of things that could cause my issue. He said one easy thing to try when it fades out was to jump the effects loop send and receive with an instrument cable, because it can get tarnished and think it's in use when it's not, thus cutting out the sound. I played on it for the first time in a while yesterday(long standing issue, been using my Marshall), and I didn't have any problem. So I haven't been able to try that yet.

I'm thinking if it does it again(fingers crossed it doesn't and it just magically fixes itself :lol: ), I'm going to take it to the tech I talked to and see what he can find. Also if he's willing to change out those resistors and add a fan, because that's beyond my skill level.

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